Improvement in elevators



Patented May 21,1872.

A. B DARLING & JAMES BONES. flmprove ment in Elevators.

A y d 1M. Pl-(UTU diff/063711 1779 "0, M K (0580/1/75? P500555,

UNITED STATES PATENT O rrrcn ALFRED B. DARLING AND JAMES BONES, OF NEW YORK, N. Y.

IMPROVEMENT lN ELEVATORS..

Specification forming part of Letters Patent No. 126,935, dated May 21, 1872.

Specification describing a new and useful Improvement in Safety Elevators, invented by ALFRED B. DARLING and J AMEs BoNEs, of the city, county, and State of New York.

Figure 1 is a side elevation of an elevator, showing our improvements in position for operation. Fig. 2 is a sectional elevation of the same. Fig. 3 is a plan view of our improvement. Fig. 4 is an enlarged elevation of the Windlass-bearing.

Similar letters of reference indicate corresponding parts.

The object of this improvementis to prevent the falling of the elevator-platform in case of the breakage of the main lifting-rope.

A A"A A, frame of the elevator; B B, guide-ribs, between which the platform 0, which is of ordinary'construction, rises and falls in the usual manner. The platform is operated by a central or main lifting-rope, D, connected to the cross-bar a of the platform (3. This rope 1) passes one or more times over the main driving-windlassE; thence down behind or outside of the rib 13, over a pulley to be placed at If thence to a steam or manual Windlass, from which the operating power for working the elevator is to be derived. E is a gear-wheel upon the Windlass E, said wheel being always in gear with a pinion, F, which is attached to a safetyindlass, F,'and the pinion Fis always in gear with another pinion, G, which is attached to another safetywindlass, G. Safety-ropes H H are wound, respectively, upon the windlasses F G, and extend to the cross-bar a of the platform, the said ropes being attached to adjustable screw-bolts b b, which formparts of the swivelhooks c c, which hook into eyes (1 d onthe cross-bar a, as shown. By turning the screw-bolts b b the ropes H H may be readily adjusted. The pinions F G and their windlasses have their bearings in the framepieces A,which rest on the framepieces A. The revolution of the gear-wheel E operates the pinions F G, and thus causes the ropes H H to wind or unwind, according to the direction in which the windlasses F G are operated by the wheel E. The Windlass E forms alocking device, and operates, as will be now described, so as to lock the safetywindlasses F G on breakage of the main litting-rope. The bearings of Windlass E and its gear-wheel E are set in the ends of levers J J, which are pivoted at e to the frame-pieces A. The Windlass E and its gear-wheel E are, therefore, movable with the levers J J. The latter are connected at their upper extremities by a cross-bar, H, on which one or more weights, L, are suspended, which weights tend to press the lower ends of the levers J J upward, so as to carry the teeth of the gearwheel E into gear with the teeth of the pinion G. This tendency of the weights L to carry the gear-wheel E into gear with the pinions Gr is counteracted by the greater weight of the platform 0 on rope D, which holds down the Windlass E, and so takes the gear-wheel E away from and out of contact with the pinion G. When the gear-wheel E and Windlass E are thus pressed down their bearings are supported in sliding blocks 9 arranged in the frame-pieces A, in slotted openings therein, which openings are of such form as to permit a rising movement of the said blocks. Should the rope D suddenly break, the safety-ropes H H then receive the weight of the platform, and, thewindlass E beingrelieved of the weight of the platform, the weights H then act upon the levers J J, which lift the Windlass E and carry up its gear-wheel E into contact with the pinion G, and thus both of the pinions F G are brought into gear with the wheel E, which effectually locks the pinions F G, preventing their rotation, while the platform 0 remains supported by the safety-ropes H H, the fall of the platform being thus prevented. As here shown, only one end of each Windlass is provided with gear-wheels; but it will be readily understood that both ends of each Windlass may be provided with gear-wheels, and that the operation will be the same as described. Instead of the weights H and le-' vers .J, springs may be applied at the back of the blocks 9 to move the windlass E, as herein described.

We do not limit or confine ourselves to the precise forms or arrangements of the parts herein described, as they may be varied without departing from our invention.

Having thus described our invention, we claim as new and desire to secure by Letters Patent f 1. The combination, with the safety-Windlasses and their ropes, of the locking device and its rope, operating substantially as herein described, so as to lock the said \viudlasses on breakage of the main lifting-rope, as set forth.

2. The combination, with the movable windlass and its rope of the weighted levers J, or equivalent devices for moving the said Windlass into look with the windlasses on which the safety-ropes are wound, substantially as herein described.

3. The combination of the lifting-rope With the movable Windlass and the platform, in the manner substantially as described, so that said rope will operate the Windlass and platform and at the same time keep the Windlass out of lock with the safety-windlasses, as set forth.

ALFRED B. DARLING. JAMES BONES.

Witnesses:

S. B. CHAFFEE, E. R. PEASE. 

